UMVE: Fix Qt 5.15 deprecation warnings

Fixes the following deprecation warnings when compiling against Qt 5.15:

TODO: Add warning messages

apps/umve/batchoperations.cc

@@ -17,6 +17,7 @@
 #include <QMessageBox>
 #include <QProgressDialog>
 #include <QApplication>
+#include <QAbstractEventDispatcher>
 
 #include "util/file_system.h"
 #include "mve/mesh_io_ply.h"
@@ -549,7 +550,7 @@ BatchGenerateThumbs::on_generate (void)
         return;
 
     this->setDisabled(true);
-    while (QApplication::hasPendingEvents())
+    while (QApplication::eventDispatcher()->hasPendingEvents())
         QApplication::processEvents();
 
     std::string embedding_name = this->embedding_name.text().toStdString();

apps/umve/clickimage.h

@@ -69,7 +69,7 @@ ClickImage::set_scale_factor (double factor)
     if (this->scale_factor == 1.0)
         this->adjustSize();
     else
-        this->resize(this->scale_factor * this->pixmap()->size());
+        this->resize(this->scale_factor * this->pixmap(Qt::ReturnByValue).size());
 }
 
 inline void
@@ -102,7 +102,7 @@ ClickImage::mouseMoveEvent (QMouseEvent* event)
 inline void
 ClickImage::wheelEvent (QWheelEvent* event)
 {
-    QPoint const& pnt = this->get_image_coordinates(event->pos());
+    QPoint const& pnt = this->get_image_coordinates(event->position().toPoint());
     emit this->mouse_zoomed(pnt.x(), pnt.y(), event);
 }
 
@@ -111,7 +111,7 @@ ClickImage::get_image_coordinates (QPoint pnt) const
 {
     if (this->hasScaledContents())
     {
-        QSize ps(this->pixmap()->size());
+        QSize ps(this->pixmap(Qt::ReturnByValue).size());
         QSize ws(this->size());
 
         float scale_x = (float)ps.width() / (float)ws.width();

apps/umve/glwidget.cc

@@ -159,14 +159,14 @@ GLWidget::wheelEvent (QWheelEvent* event)
 {
     this->makeCurrent();
     ogl::MouseEvent e;
-    if (event->delta() < 0)
+    if (event->angleDelta().y() < 0)
         e.type = ogl::MOUSE_EVENT_WHEEL_DOWN;
     else
         e.type = ogl::MOUSE_EVENT_WHEEL_UP;
     e.button = ogl::MOUSE_BUTTON_NONE;
     e.button_mask = event->buttons();
-    e.x = event->x() * this->device_pixel_ratio;
-    e.y = event->y() * this->device_pixel_ratio;
+    e.x = event->position().x() * this->device_pixel_ratio;
+    e.y = event->position().y() * this->device_pixel_ratio;
     this->context->mouse_event(e);
     this->repaint_async();
 }

apps/umve/sceneoverview.cc

@@ -147,7 +147,7 @@ SceneOverview::add_view_to_layout (std::size_t id, mve::View::Ptr view)
     QListWidgetItem* item = new QListWidgetItem(icon,
         tr("%1\n%2").arg(name, images));
     if (!cam_valid)
-        item->setBackgroundColor(QColor(255, 221, 221)); // #ffdddd
+        item->setBackground(QColor(255, 221, 221)); // #ffdddd
     item->setData(Qt::UserRole, (int)id);
     this->viewlist->addItem(item);
 }

apps/umve/viewinspect/scrollimage.cc

@@ -54,7 +54,7 @@ ScrollImage::update_image_size (void)
 void
 ScrollImage::max_image_size (void)
 {
-    QSize imgsize(this->image->pixmap()->size());
+    QSize imgsize(this->image->pixmap(Qt::ReturnByValue).size());
     QSize newsize = imgsize.scaled(this->maximumViewportSize(),
         Qt::KeepAspectRatio);
     this->image->set_scale_factor(static_cast<float>(newsize.width())
@@ -83,7 +83,7 @@ ScrollImage::resizeEvent (QResizeEvent* event)
     //std::cout << "Resize Event: " << event->size().width() << "x"
     //    << event->size().height() << std::endl;
 
-    if (this->scale_contents && this->image->pixmap())
+    if (this->scale_contents && !!this->image->pixmap(Qt::ReturnByValue))
         this->max_image_size();
 }
 
@@ -119,12 +119,12 @@ ScrollImage::mouse_zoomed (int x, int y, QWheelEvent* event)
         return;
     }
     QPoint old_pnt(x, y);
-    if (event->delta() > 0)
+    if (event->angleDelta().y() > 0)
         this->set_scale(this->get_scale() * MOUSE_ZOOM_IN_FACTOR);
     else
         this->set_scale(this->get_scale() * MOUSE_ZOOM_OUT_FACTOR);
 
-    QPoint new_pnt = this->image->get_image_coordinates(event->pos());
+    QPoint new_pnt = this->image->get_image_coordinates(event->position().toPoint());
     QPoint diff = (old_pnt - new_pnt) * this->get_scale();
     this->move_scrollbar(this->horizontalScrollBar(), diff.x());
     this->move_scrollbar(this->verticalScrollBar(), diff.y());
@@ -151,10 +151,10 @@ ScrollImage::move_scrollbar (QScrollBar* bar, int delta)
 void
 ScrollImage::save_image (std::string const& filename)
 {
-    QPixmap const* pm = this->image->pixmap();
+    QPixmap pm = this->image->pixmap(Qt::ReturnByValue);
     if (!pm)
         throw std::runtime_error("No image set");
-    bool ret = pm->save(filename.c_str());
+    bool ret = pm.save(filename.c_str());
     if (!ret)
         throw std::runtime_error("Unable to save image");
 }

apps/umve/viewinspect/scrollimage.h

@@ -46,7 +46,7 @@ private slots:
     ScrollImage (void);
 
     void set_pixmap (QPixmap const& pixmap);
-    QPixmap const* get_pixmap (void) const;
+    QPixmap get_pixmap (void) const;
     ClickImage* get_image (void);
 
     void set_auto_scale (bool value);
@@ -116,10 +116,10 @@ ScrollImage::set_scale (double scale)
     return this->image->set_scale_factor(scale);
 }
 
-inline QPixmap const*
+inline QPixmap
 ScrollImage::get_pixmap (void) const
 {
-    return this->image->pixmap();
+    return this->image->pixmap(Qt::ReturnByValue);
 }
 
 inline ClickImage*

apps/umve/viewinspect/viewinspect.cc

@@ -229,7 +229,7 @@ ViewInspect::show_details (bool show)
 void
 ViewInspect::update_actions (void)
 {
-    bool active = this->scroll_image->get_pixmap() != nullptr;
+    bool active = !!this->scroll_image->get_pixmap();
     this->action_zoom_fit->setEnabled(active);
     this->action_zoom_in->setEnabled(active);
     this->action_zoom_out->setEnabled(active);
@@ -700,7 +700,7 @@ ViewInspect::on_ply_export (void)
 void
 ViewInspect::on_image_export (void)
 {
-    if (!this->scroll_image->get_image()->pixmap())
+    if (!this->scroll_image->get_image()->pixmap(Qt::ReturnByValue))
     {
         QMessageBox::critical(this, "Cannot save image", "No such image");
         return;